Atomic and nuclear properties of soft tissue (ICRU four-component)
QuantityValueUnits ValueUnits
<Z/A> 0.54975     
Specific gravity 1.000 g cm-3   
Mean excitation energy 74.9 eV   
Minimum ionization 1.972 MeV g-1cm2 1.972 MeV cm-1
Nuclear collision length 58.5 g cm-2 58.53 cm
Nuclear interaction length 83.5 g cm-2 83.49 cm
Pion collision length 86.0 g cm-2 86.01 cm
Pion interaction length 115.4 g cm-2 115.4 cm
Radiation length 36.85 g cm-2 36.85 cm
Critical energy 79.68 MeV (for e-) 77.56 MeV (for e+)
Molière radius 9.81 g cm-2 9.806 cm
Plasma energy ωp 21.37 eV   
Muon critical energy 1042. GeV   
Composition:
Elem ZAtomic frac* Mass frac
H
1
1.00
0.101172
C
6
0.09
0.111000
N
7
0.02
0.026000
O
8
0.47
0.761828
* calculated from mass fraction data

For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PDF TEXT
Table of muon dE/dx and Range: PDF TEXT
Explanation of some entries